CN102735212B - Monitoring method for subgrade settlement, and device thereof - Google Patents
Monitoring method for subgrade settlement, and device thereof Download PDFInfo
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- CN102735212B CN102735212B CN201210201264.4A CN201210201264A CN102735212B CN 102735212 B CN102735212 B CN 102735212B CN 201210201264 A CN201210201264 A CN 201210201264A CN 102735212 B CN102735212 B CN 102735212B
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Abstract
The present invention discloses a monitoring method for subgrade settlement, and a device thereof. The method is characterized in that monitoring nodes are provided, wherein the monitoring node comprises a container, a liquid is arranged inside the container, the container is provided with a detector, the detector is used to monitor change of the liquid level and transmit the monitoring situation to a monitoring center, and the monitoring nodes are arranged every a certain distance on a subgrade requiring monitoring. The method and the device have the following advantages that: the measurement precision is high, no manual operation is required during the measurement process, the information can be transmitted to the monitoring center at a rapid rate, the installation and the use are convenient, and real time monitoring of large rang subgrade settlement is prompted.
Description
Technical field
The present invention relates to the roadbed technical field whether sedimentation is monitored, an embodiment disclosed in present specification, be specifically related to a kind ofly realize the method for monitoring the sedimentation of roadbed and device thereof by wireless network and ultrasound wave.
Background technology
Roadbed is an important component part of railway project, is the basis of bearing track structure weight and train load, is also the weakest least stable component in line project.In the construction of engineering and after completion, roadbed inevitably deforms under the effect of load and other factors, produces evenly or non-uniform settling.The particularly uneven settlement polar of settlement after construction may cause the cracking of railway agent structure, crooked and destroy, and also likely creates certain impact to the buildings around engineering and underground utilities simultaneously.Therefore consider from the construction quality secure context of railway, monitor and forecast must be carried out to subgrade settlement.
Common method at present for subgrade settlement monitoring has:
1, settlement plate method: as shown in Figure 1, settlement plate base, along with subgrade settlement, by the measuring staff be connected with base, can record the subgrade settlement value that base buries place underground.But easily destroyed in construction, and remedying after damaging is very difficult; Settlement plate can only to measure in embankment any sedimentation, belongs to spot measurement.
2, stake method is monitored: monitoring stake timber and drill rod hammer in soil, maintain an equal level, can measure the settling amount of soil body surface with spirit-leveling instrument.There is interference to fill construction, also belong to spot measurement.
3, horizontal inclinometer: by testing the lateral shift of ground, judge the stability of foundation soil, and the sedimentation that estimation lateral shift produces.But cost is high, directly can not obtains the sedimentation of any point, not easily demarcate at the construction field (site).
4, hydraulic type Section type settlement instrument: the foraminate dividing plate of band is imbedded underground various point locations to be measured by bore mode in advance, the sedimentation value at this place can be recorded by the hydraulic pressure measuring dividing plate place.But cost is high, precision is easily affected by environment, and operational sequence is complicated, and instrument is inconvenient to carry, and required personnel are more in test.
5, magnet ring sedimentometer: after rig pore-forming, puts into hole by delaminating deposition pipe and magnet ring delaminating deposition mark, by the degree of depth of electromagnetic induction signal reflection sedimentation ring.But the correct placement difficulty of magnet ring, the flexible of scale self affects precision, has interference to fill construction, and machinery easily breaks sedimentation pipe.
Above method is traditional building mensuration, ubiquity measuring accuracy is low, need manual operation, information transfer rate is slow, the settling amount that can only measure single place, installation and the shortcoming such as use is inconvenient, is unfavorable for the Real-Time Monitoring of subgrade settlement on a large scale.
Summary of the invention
Instant invention overcomes the deficiencies in the prior art, provide a kind of monitoring method and device thereof of subgrade settlement, one of object is, solving in prior art can only spot measurement, and measures inaccurate technical matters.
Consider the problems referred to above of prior art, according to an aspect disclosed by the invention, the present invention by the following technical solutions:
A monitoring method for subgrade settlement, comprises monitoring node,
Described monitoring node comprises a container, is provided with liquid in described container, and described container is provided with detector, and the situation of monitoring for monitoring the change of liquid level, and is transferred to monitoring center by described detector;
To monitor on roadbed, a monitoring node is being set every a segment distance;
According to the described situation will monitoring roadbed, determine a region of a monitoring roadbed whether sedimentation, at least two monitoring nodes are set in described region, and by the fluid connection of all monitoring inter-nodes to form linker, by the comparison to each monitoring node liquid level change in described region, and show whether the roadbed of somewhere/monitoring node position, a few place sedimentation occurs.
In order to realize the present invention better, further technical scheme is:
As preferably, the change of liquid level is passed to monitoring center by wireless network by described detector.
As preferably, described detector is the change by monitoring ultrasonic liquid level.
As preferably, described detector comprises a transmitting probe and two receiving transducers, and described two receiving transducers are not at sustained height, and in the vertical direction staggers mutually, and make two mounting distances between receiving transducer and transmitting probe, equal respective hyperacoustic actual propagation distance.
In order to better implement above-mentioned method, the following discloses a kind of monitoring device of subgrade settlement, comprising,
Casing, described casing, built with liquid, described casing is connected with water tank connecting pipe;
Installation shaft, described installation shaft is connected with casing by stationary installation, and is positioned at the top of liquid;
Transmitting probe, described transmitting probe is connected with installation shaft by axle sleeve;
First receiving transducer, described first receiving transducer is connected with installation shaft by the first probe mount pad;
Second receiving transducer, described second receiving transducer is connected with installation shaft by the second probe mount pad;
Described two receiving transducers are not at sustained height, and in the vertical direction staggers mutually;
Described installation shaft, transmitting probe, the first receiving transducer and the second receiving transducer, the central axis at place all with horizontal plane;
Spirit bubble, described spirit bubble is positioned in stationary installation, for checking described installation shaft, transmitting probe, the first receiving transducer and the second receiving transducer, the central axis at place whether with horizontal plane.
As preferably, described stationary installation comprises box cover, flange mount pad and leveling screw, described installation shaft is connected with flange mount pad, and described installation shaft is vertical with the upper surface of flange mount pad, described flange mount pad is connected with box cover by horizontal adjustment screw, and described box cover is connected with casing.
As preferably, described spirit bubble is arranged on the upper surface of described flange mount pad.
As preferably, described leveling screw is three, and become 120 ° uniform.
As preferably, described box cover is also provided with pivot screw, and described pivot screw is also connected with the circle centre position of the upper surface of flange mount pad.
The present invention can also be:
As preferably, described box cover is provided with solar energy module mount pad, described solar energy module mount pad is provided with U-shaped support, described U-shaped support is connected with cell panel runing rest, described cell panel runing rest is connected with solar panel, and described solar panel is transmitting probe, the first receiving transducer and the second receiving transducer are powered.
Compared with prior art, one of beneficial effect of the present invention is:
By monitoring method and the device thereof of this subgrade settlement, (1) utilizes law of connected vessels, makes the liquid level of each monitor be in same level, by measuring monitor relative to the change of liquid level, calculates settling amount; (2) adopt ultrasound wave relative type motor to measure structure, eliminate the measuring error brought by sonic velocity change; (3) adopt the vertical adjustment mechanism of ultrasonic probe, overcome when monitor is installed at the scene because non-horizontal places the measuring error caused.
Have that measuring accuracy is high, do not need manual operation in measuring process, that information can be transferred to Surveillance center, installation and use with speed is faster also very convenient, be conducive to the Real-Time Monitoring of subgrade settlement on a large scale.
In actual applications, measure and can not cause measuring inaccurate situation because the various factors such as the temperature of propagation medium, pressure, humidity, density have an impact to the velocity of sound.
Powered by the monitoring device of sun power to this subgrade settlement, make power supply convenient.
Accompanying drawing explanation
In order to clearer explanation present specification embodiment or technical scheme of the prior art, below the accompanying drawing used required in the description to embodiment or prior art is briefly described, apparently, the accompanying drawing that the following describes is only the reference to some embodiments in present specification, for those skilled in the art, when not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 shows the schematic diagram of the monitoring method of the subgrade settlement according to a present specification embodiment;
Fig. 2 shows the schematic diagram of the monitoring method of the subgrade settlement according to another embodiment of present specification;
Fig. 3 shows the schematic diagram of ultrasonic probe and surface level out of plumb situation;
Fig. 4 shows the schematic diagram of the monitoring method of the subgrade settlement according to another embodiment of present specification;
Fig. 5 shows the schematic diagram of the monitoring device of the subgrade settlement according to another embodiment of present specification;
Fig. 6 is the left-hand schematic diagram with reference to figure 5;
Fig. 7 is to schematic diagram with reference to the A of figure 5;
Fig. 8 is electrical system block diagram;
Fig. 9 is the U-shaped supporting structure schematic diagram of an embodiment;
Figure 10 is the cell panel rotary bracket structure schematic diagram of an embodiment;
Figure 11 is the 3D exploded perspective view of the monitoring device of the subgrade settlement of an embodiment.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
A monitoring method for subgrade settlement, comprises monitoring node,
Described monitoring node comprises a container, is provided with liquid in described container, and described container is provided with detector, and the situation of monitoring for monitoring the change of liquid level, and is transferred to monitoring center by described detector;
To monitor on roadbed, a monitoring node is being set every a segment distance;
According to the described situation will monitoring roadbed, determine a region of a monitoring roadbed whether sedimentation, at least two monitoring nodes are set in described region, and by the fluid connection of all monitoring inter-nodes to form linker, by the comparison to each monitoring node liquid level change in described region, and show whether the roadbed of somewhere/monitoring node position, a few place sedimentation occurs.
The change of liquid level is passed to monitoring center by wireless network by described detector.
Described detector is the change by monitoring ultrasonic liquid level.
Fig. 1 shows the schematic diagram of the monitoring method of the subgrade settlement according to a present specification embodiment.An embodiment with reference to the monitoring method of subgrade settlement shown in figure 1:
Along railway line, a monitoring node (namely installing a settlement monitor) is set every a segment distance.As shown in Figure 1, all monitor pipeline communications, form linker.Because the atmospheric pressure in some areas can not have very big difference, when the same liquid therefore in linker does not flow, in each container, liquid level that is direct and atmosphere always keeps sustained height.If somewhere ground generation sedimentation, the distance D meeting respective change in monitor between measuring sonde and liquid level; When monitoring node is abundant, when namely monitoring range is enough large, can thinks that this ground there occurs non-uniform settling, by comprehensively analyzing the D value that each monitor measures, its settling amount can be obtained, and by wireless network, each D value is transferred to monitoring center.
Fig. 2 shows the schematic diagram of the monitoring method of the subgrade settlement according to another embodiment of present specification.Another embodiment with reference to the monitoring method of subgrade settlement shown in figure 2:
Measurement accuracy D value is the precondition ensureing that Monitoring Data is reliable, stable.Ultrasonic ranging method is that sound wave and the mistiming Δ t that receives between echoed signal launched in record, obtains popping one's head in and the distance of barrier by the product calculating acoustic wave propagation velocity V and Δ t.But, stable and accurately velocity of sound V be the necessary condition ensureing measuring accuracy, in actual applications, the various factors such as temperature, pressure, humidity, density of propagation medium all can have a direct impact velocity of sound V.
The present embodiment, by relative type motor measuring method, overcomes the impact of fluctuation on measuring accuracy of speed V.As shown in Figure 2, the receiving transducer of a transmitting probe (object is all identical in order to ensure the condition such as frequency, amplitude transmitted, and reduces error) and two certain altitudes that mutually stagger.The inner space of monitor is less, and can think that propagation medium is uniform, therefore speed V is consistent.Can obtain thus:
2D+H
1＝V×T
1； （1）
2D+H
2＝V×T
2； （2）
In formula: H
1, H
2-transmitting probe to the difference in height of receiving transducer 16,13, mm; D-transmitting probe distance liquid level distance, mm; T
1, T
2-receiving transducer 13 and 16 detects the time of echo respectively, s.
By (1) formula, (2) formula can try to achieve find range from:
D＝(H
1T
2-H
2T
1)/2(T
1-T
2) （3）
Can be found out by (3) formula, D value is measured and is had nothing to do with velocity of sound V.
Can draw from above analysis, another embodiment of the monitoring method of subgrade settlement is, described detector comprises a transmitting probe and two receiving transducers, described two receiving transducers are not at sustained height, and in the vertical direction staggers mutually, and make two mounting distances between receiving transducer and transmitting probe, equal respective hyperacoustic actual propagation distance.
On basis embodiment illustrated in fig. 2, being further analyzed, as shown in Figure 3, is ultrasonic probe and surface level off plumb situation.
Only when ultrasonic probe is completely perpendicular to surface level, the propagation distance of sound wave between transmitting probe to receiving transducer just equals mounting distance.But in actual applications, complicated field condition makes monitor possibility horizontal positioned hardly, as the H in Fig. 3
1', H
2' be Acoustic Wave Propagation distance, H
1, H
2for mounting distance, obvious H
1≠ H
1', H
2≠ H
2', this produces comparatively big error by causing the measurement of D value.
In order to solve above-mentioned produced problem, Fig. 4 shows the schematic diagram of the monitoring method of the subgrade settlement according to another embodiment of present specification.
According to the principle of 3 fixed 1 planes in space, the present embodiment adopts the vertical adjusting scheme as Fig. 4, with center of circle O for fulcrum, namely first by L
0value is fixing, by changing L
1, L
2, L
3length value, an O can be changed
1, O
2and O
3locus, thus the end face of mounting rod of making to pop one's head in rotates around fulcrum O, reaches the object of vertical adjusting, wherein detector top 401, mounting rod 402 of popping one's head in.
Consider method disclosed in above-described embodiment, inventor by experiment and research drawn a kind of monitoring device of subgrade settlement, be described below by way of the structure of some specific embodiments to this device.
Fig. 5 shows the schematic diagram of the monitoring device of the subgrade settlement according to another embodiment of present specification.With reference to an embodiment of the monitoring device of subgrade settlement shown in figure 5, comprise,
Casing 7, described casing 7, built with liquid, described casing 7 is connected with water tank connecting pipe 21, and water tank connecting pipe 21 is by connecting tube head 20 and casing 7, and each settlement monitor/casing 7 forms linker by water tank connecting pipe 21.
Installation shaft 14, described installation shaft 14 is connected with casing 7 by stationary installation, and installation shaft 14 is positioned at the top of liquid.Concrete structure for stationary installation can be, comprise box cover 6, flange mount pad 11 and leveling screw 9, described installation shaft 14 is connected with flange mount pad 11, and described installation shaft 14 is vertical with the upper surface of flange mount pad 11, described flange mount pad 11 is connected with box cover 6 by horizontal adjustment screw 9, and described box cover 6 is connected with casing 7.The other end of installation shaft 14 can be connect with the coaxial inner of flange mount pad 11 and fix.
Transmitting probe 18, described transmitting probe 18 is connected with installation shaft 14 by axle sleeve 17, Ke Yishi, and transmitting probe 18 one end with installation shaft 14 is interconnected by axle sleeve 17, to ensure that the two is coaxial.
Described first receiving transducer 13 is connected with installation shaft 14 by the first probe mount pad; Described second receiving transducer 16 is connected with installation shaft 14 by the second probe mount pad 15; Two receiving transducers are not at sustained height, and in the vertical direction staggers mutually; Can be that the central shaft of they and transmitting probe 18 is parallel to each other, to reduce measuring error, the precision of the distance that simultaneously also ensures mutually to stagger between probe.
Described installation shaft 14, transmitting probe 18, first receiving transducer 13 and the second receiving transducer 16, the central axis at place all with horizontal plane;
Spirit bubble 12, described spirit bubble 12 is positioned in stationary installation, for checking described installation shaft 14, transmitting probe 18, first receiving transducer 13 and the second receiving transducer 16, the central axis at place whether with horizontal plane.
Wherein, described spirit bubble can be the upper surface being arranged on described flange mount pad, and described leveling screw is three, and become 120 ° uniform.Can be that 3 leveling screw 9 are each passed through box cover 6, connect with 120 ° of uniform threaded holes with on flange mount pad 11, as shown in Figure 7; Observe the spirit bubble 12 that flange mount pad 11 end face is installed, the length adjusting these 3 screws makes end face level, and then reaches and make probe vertical in the object of surface level.
Described box cover 6 is also provided with pivot screw 10, and described pivot screw 10 is also connected with the circle centre position of the upper surface of flange mount pad 11.Can be that pivot screw 10 is fixed on box cover 6 by screw thread, the center of circle of pivot flange mount pad 11.
Box cover 6 also can arrange dust-proof side's lid 8.
In order to better indicate the concrete structure of the monitoring device of subgrade settlement, can see 3D blast diagram as shown in figure 11.
As shown in Figure 6, the sidewall of casing 7 has a strip hole, the graduated water level observation window 19 of band has been installed, has maintained easily and debugging.
Described box cover 6 is provided with solar energy module mount pad 5, described solar energy module mount pad 5 is provided with U-shaped support 4, described U-shaped support 4 is connected with cell panel runing rest 2, described cell panel runing rest 2 is connected with solar panel 1, and described solar panel 1 is powered for transmitting probe 18, first receiving transducer 13 and the second receiving transducer 16.Also can comprise the electrical installation box 3 for electrical install and accumulator.
Settlement monitor provides the energy by solar cell, according to the solar illumination angle of local latitude, can be adjusted the angle of itself and U-shaped support 4, make solar panel 1 obtain the suitable angle of pitch by the bar hole on cell panel runing rest 2.Wherein, the concrete structure of U-shaped support 4 can be as shown in Figure 9, and the opposition both sides of U-shaped support 4 are respectively provided with three apertures carrying out coordinating with the bar hole on cell panel runing rest 2.
The concrete structure of cell panel runing rest 2 can be as shown in Figure 10, and cell panel runing rest 2 comprises two parts, the cell panel runing rest 2 of every part is all provided with the bar hole of two sections of arcs and one for rotating fixing aperture.
With reference to above-mentioned disclosed embodiment, the present embodiment discloses a kind of control system being suitable for said apparatus.
As shown in Figure 8, monitor adopts solar powered, and by unnecessary energy storage in accumulator, belongs to independently self-contained electric system.After Single Chip Microcomputer (SCM) system generation pulse signal is amplified by power driver module, drive ultrasound wave transmitting probe T to send ultrasound wave, inner 16 digit counters start timing simultaneously.The sound echo detected is converted to electric signal by receiving transducer R1, R2 respectively, echo detecting module is amplified and shaping this electric signal, and send interrupt request with pulse singaling to Single Chip Microcomputer (SCM) system, single-chip microcomputer then reads the numerical value in 16 digit counters, the sound time delay of each receiving transducer can be calculated according to the frequency of counter clock, accuracy of timekeeping is not less than ± 1us, thus the distance calculated between transmitting probe and liquid level, then single-chip microcomputer resets the value of 16 digit counters, waits for and measuring next time.Single-chip microcomputer by the liquid level distance value at every turn detected wirelessly (as ZigBee, GPRS, GSM etc.) be transferred to monitoring center.
Operation steps is as follows:
1, single-chip microcomputer produces pulse signal, and signal sends ultrasound wave through power amplification rear drive ultrasonic transducer T, and 16 digit counters start timing simultaneously.
2, the acoustic energy of probing wave echo is converted to electric signal by ultrasonic reception probe R1 and R2 respectively, realizes the reception of ultrasonic echo.
3, the electric signal received is amplified and shaping, send interruption application with pulse singaling to single-chip microcomputer.
4, single-chip microcomputer response is corresponding interrupts, and reads the count value of 16 digit counters, calculates the time interval from being transmitted into reception.
5, single-chip microcomputer is according to each time interval, calculates liquid level distance value.
6, reset 16 digit counters, and this measurement data is wirelessly sent to monitoring center.
In this instructions, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiment, identical similar portion cross-reference between each embodiment.
Spoken of in this manual " embodiment ", " another embodiment ", " embodiment ", etc., refer to the specific features, structure or the feature that describe in conjunction with this embodiment and be included at least one embodiment of the application's generality description.Multiple place occurs that statement of the same race is not necessarily refer to same embodiment in the description.Furthermore, when describing specific features, structure or a feature in conjunction with any embodiment, what advocate is also fall within the scope of the invention to realize this feature, structure or feature in conjunction with other embodiments.
Although with reference to multiple explanatory embodiment of the present invention, invention has been described here, but, should be appreciated that, those skilled in the art can design a lot of other amendment and embodiment, these amendments and embodiment will drop within spirit disclosed in the present application and spirit.More particularly, in the scope of, accompanying drawing open in the application and claim, multiple modification and improvement can be carried out to the building block of subject combination layout and/or layout.Except the modification of carrying out building block and/or layout is with except improvement, to those skilled in the art, other purposes also will be obvious.
Claims (3)
1. a monitoring device for subgrade settlement, is characterized in that, comprises,
Casing, described casing, built with liquid, described casing is connected with water tank connecting pipe;
Installation shaft, described installation shaft is connected with casing by stationary installation, and is positioned at the top of liquid;
Transmitting probe, described transmitting probe is connected with installation shaft by axle sleeve;
First receiving transducer, described first receiving transducer is connected with installation shaft by the first probe mount pad;
Second receiving transducer, described second receiving transducer is connected with installation shaft by the second probe mount pad;
Described two receiving transducers are not at sustained height, and in the vertical direction staggers mutually;
Described installation shaft, transmitting probe, the first receiving transducer and the second receiving transducer, the central axis at place all with horizontal plane;
Spirit bubble, described spirit bubble is positioned in stationary installation, for checking described installation shaft, transmitting probe, the first receiving transducer and the second receiving transducer, the central axis at place whether with horizontal plane;
Described stationary installation comprises box cover, flange mount pad and leveling screw, described installation shaft is connected with flange mount pad, and described installation shaft is vertical with the upper surface of flange mount pad, described flange mount pad is connected with box cover by horizontal adjustment screw, and described box cover is connected with casing; Described leveling screw is three, and become 120 ° uniform; Described box cover is also provided with pivot screw, and described pivot screw is connected with the circle centre position of the upper surface of flange mount pad.
2. the monitoring device of subgrade settlement according to claim 1, is characterized in that, described spirit bubble is arranged on the upper surface of described flange mount pad.
3. the monitoring device of subgrade settlement according to claim 1 and 2, it is characterized in that, described box cover is provided with solar energy module mount pad, described solar energy module mount pad is provided with U-shaped support, described U-shaped support is connected with cell panel runing rest, described cell panel runing rest is connected with solar panel, and described solar panel is transmitting probe, the first receiving transducer and the second receiving transducer are powered.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210201264.4A CN102735212B (en) | 2012-06-18 | 2012-06-18 | Monitoring method for subgrade settlement, and device thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210201264.4A CN102735212B (en) | 2012-06-18 | 2012-06-18 | Monitoring method for subgrade settlement, and device thereof |
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| CN102735212A CN102735212A (en) | 2012-10-17 |
| CN102735212B true CN102735212B (en) | 2015-03-11 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103674777B (en) * | 2013-12-23 | 2016-03-02 | 安徽省金田建筑设计咨询有限责任公司 | A kind of test method measuring settling amount after the abundant leaching of soil |
| CN105004317A (en) * | 2015-08-11 | 2015-10-28 | 电子科技大学 | Static liquid level system based on optical ranging |
| CN106592563B (en) * | 2017-01-09 | 2018-08-14 | 河海大学 | A kind of device and its measurement method of monitoring settlement of foundation |
| CN109827542A (en) * | 2019-03-20 | 2019-05-31 | 交通运输部天津水运工程科学研究所 | A kind of settlement of foundation automated watch-keeping facility based on laser ranging module |
| CN112630033B (en) * | 2020-12-29 | 2024-06-25 | 大连理工大学 | Buried road structure change monitoring device |
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| CN2689253Y (en) * | 2004-01-12 | 2005-03-30 | 浙江工程学院 | Supersonic measuring and displaying instrument of residual oil volume in fuel tank |
| CN101097161A (en) * | 2006-06-30 | 2008-01-02 | 北京奥麦特科技有限公司 | Device for ultrasonic measuring liquid level and method thereof |
| CN201378053Y (en) * | 2009-04-13 | 2010-01-06 | 杨豪 | Static force level gauge |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2689253Y (en) * | 2004-01-12 | 2005-03-30 | 浙江工程学院 | Supersonic measuring and displaying instrument of residual oil volume in fuel tank |
| CN101097161A (en) * | 2006-06-30 | 2008-01-02 | 北京奥麦特科技有限公司 | Device for ultrasonic measuring liquid level and method thereof |
| CN201378053Y (en) * | 2009-04-13 | 2010-01-06 | 杨豪 | Static force level gauge |
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